IUB BIOL-L 112 - The Unique Properties of Water (2 pages)

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The Unique Properties of Water



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The Unique Properties of Water

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Lecture number:
3
Pages:
2
Type:
Lecture Note
School:
Indiana University, Bloomington
Course:
Biol-L 112 - Foundations of Biology: Biological Mechanisms

Unformatted text preview:

BIOL L 112 1nd Edition Lecture 2 Outline of Last Lecture I Water s Role in Life A Electronegativity and the Difference Between Polar and Nonpolar Molecules II Water s Ability to Form Hydrogen Bonds III Four Emergent Properties of Water A Water is Cohesive B Water Moderates Temperature Outline of Current Lecture I Four Emergent Properties of Water Continued a Water Expands Upon Freezing b Water is a Versatile Solvent II Acids and Bases Current Lecture I Water has four unique properties because of hydrogen bonding that make life possible A The third unique property of water is the fact that it expands upon freezing In liquid water the hydrogen bonds are unstable and change arrangement causing the molecules to be closer together In a solid crystal of ice each water molecule is in a fixed structure with other water molecules around it and is 10 less dense than liquid water Ice floats on water because it is less dense which allows life to exist under frozen surfaces B The fourth property of water is its versatility as a solvent dissolving agent Because water is a polar molecule and forms hydrogen bonds easily it forms a hydration shell It is even able to dissolve large protein molecules if it has many ionic and polar regions present Definitions Hydration shell A sphere of water molecules that surround a substance when it is dissolved in water Hydrophilic Has affinity for water Hydrophobic Does not have affinity for water repels water These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute C Acidic and basic conditions affect living organisms For example the lumen of the stomach is very acidic with a pH of 2 The function of the acid in the stomach is to denature proteins and kill microorganisms Acidic and basic conditions modify the H and OH concentrations in a solution An acid serves to increase the proton concentration while a base serves to reduce the proton concentration



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